Experiment - Flux, Irradiance, wavelength from Temperature

[Natalie Johnson]

In my experimental setup I have a purpose built small aluminium tube that has a black layer on the inside to mimic a blackbody.

The tube is heated so the inside emits as a blackbody. A separate temperature sensor attached to the tube gives the temperature of the tube.

I have a thermopile sensor inside the tube that reads temperature of the surface of the blackbody. I am confused how I can convert this data into quantities such as spectral radiance, radiance, wavelengths or flux.

Using Wien Displacement Law I know I can get the peak wavelength emission of the blackbody from
Peak wavelength = wien Displacement constant / temperature

The temperature will be the value recorded by the thermopile sensor.

I really don't understand how to extract anymore data from my temperature reading ... Radiometry is somewhat confusing! Please can someone assist

 

[gtoguy97]

in explaining how I can convert the temperature reading into spectral radiance, radiance, wavelengths or flux.The temperature reading from the thermopile sensor will be a measure of the blackbody's radiant power. You can use Planck's law to calculate the spectral radiance at any given wavelength. To get the total radiance you will need to integrate the spectral radiance over all wavelengths. To get the flux, you will need to integrate the radiance over a certain area.